Increment each element by 1 minute interval in for loop

Class CustomTimer
{ 
   private DateTime startTime;
    private DateTime stopTime;
    private bool running = false;

    public void Start() 
    {
        this.startTime = DateTime.Now;
        this.running = true;
    }

    public void Stop() 
    {
        this.stopTime = DateTime.Now;
        this.running = false;
    }

    //this will return time elapsed in seconds
    public double GetElapsedTimeSecs() 
    {
        TimeSpan interval;

        if (running) 
            interval = DateTime.Now - startTime;
        else
            interval = stopTime - startTime;

        return interval.TotalSeconds;
    }

}

Now within your foreach loop do the following:

CustomTimer ct = new CustomTimer();
    ct.Start();
    // put your code here
    ct.Stop();   
  //timeinsecond variable will be set to time seconds for your execution.
  double timeinseconds=ct.GetElapsedTime();

You can use a long dummy for loop for defined interval OR use a JavaScript timer.

For timer, refer: Javascript timers[^]

Set a timer as below to execute query in a regular interval

Int Counter=0;
System.Windows.Threading.DispatcherTimer dispatcherTimer = new System.Windows.Threading.DispatcherTimer();
dispatcherTimer.Tick += new EventHandler(dispatcherTimer_Tick);
dispatcherTimer.Interval = new TimeSpan(0,0,60);



dispatcherTimer.Start();



private void dispatcherTimer_Tick(object sender, EventArgs e)
{
write your query and code here......
and set a counter to stop the timer when you want
Counter++;
if(Counter==5)
dispatcherTimer.Stop();

}